Learn That Word

Synonyms for Yowl (same or very similar meaning)

WordNet sense 1 (a very loud utterance (like the sound of an animal)):
bellow, holler, roar, roaring, bellowing, holla, hollering, hollo, holloa

WordNet sense 2 (cry loudly, as of animals):
howl, yammer, wrawl

WordNet sense 3 (utter shrieks, as of cats):

From the ODE community, based on WordNetadd/edit